CyberRota Analysis
AI-GeneratedThe vulnerability affects urllib3 versions 1.26.0 to 2.8.0, where improper separation of TLS settings allows an attacker to intercept and impersonate an HTTPS proxy, potentially leading to unauthorized access to sensitive data or modification of forwarded traffic. Applications utilizing HTTPS proxies with specific TLS configurations should prioritize this issue, especially those that apply the CERT_NONE setting, as it can lead to persistent certificate verification failures in subsequent connections. Users are advised to upgrade to version 2.8.0 or later to mitigate these risks.
Public Exploit Signal
A public exploit, PoC, GitHub repository or Metasploit reference was detected for this CVE.
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Original NVD Description
urllib3 is an HTTP client library for Python. From 1.26.0 until 2.8.0, the proxy_ssl_context, proxy_assert_hostname, proxy_assert_fingerprint, ssl_context, cert_reqs, verify_mode, use_forwarding_for_https=True, and CERT_NONE configuration paths fail to remain separated because target-server TLS settings are incorrectly applied to the HTTPS proxy connection. The trigger is that an application uses an HTTPS proxy and configures target-server TLS settings that must remain separate from the proxy TLS handshake, including HTTPS forwarding with target-specific identity or credentials. Applying cert_reqs=CERT_NONE can overwrite proxy_ssl_context.verify_mode in place, and the mutation persists so later connections reusing the same context may connect to the HTTPS proxy without certificate verification. The attack mechanism is that an attacker intercepts and impersonates the HTTPS proxy after the effective proxy policy accepts the attacker's certificate. The impact is that the attacker can observe or modify forwarded traffic or receive a target TLS client certificate, while CONNECT tunneling still preserves the separate end-to-end target TLS connection. This issue is fixed in version 2.8.0.